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/*
* Pure Data Packet module.
* Copyright (c) by Tom Schouten <tom@zwizwa.be>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*
*/
#include <stdio.h>
#include <gsl/gsl_math.h>
#include <gsl/gsl_chebyshev.h>
#include "pdp.h"
#include "pdp_imagebase.h"
typedef struct pdp_cheby_struct
{
t_pdp_imagebase x_base;
void *x_cheby;
int x_iterations;
int x_order;
gsl_cheb_series *x_cs;
gsl_function x_F;
float *x_vec;
int x_nbpoints;
} t_pdp_cheby;
static double pdp_cheby_mappingfunction(double f, void *params)
{
t_pdp_cheby *x = (t_pdp_cheby *)params;
int indx;
/* if there's no array, return the identity function */
if (!x->x_vec) return f;
/* else interpolate the array */
indx = ((f + 1) * 0.5) * (x->x_nbpoints - 1);
return x->x_vec[indx];
}
static void pdp_cheby_coef(t_pdp_cheby *x, t_floatarg c, t_floatarg f)
{
pdp_imageproc_cheby_setcoef(x->x_cheby, (int)c, f);
}
static void pdp_cheby_approx(t_pdp_cheby *x, t_symbol *s)
{
int i;
t_garray *a;
/* check if array is valid */
if (!(a = (t_garray *)pd_findbyclass(s, garray_class))){
post("pdp_cheby: %s: no such array", s->s_name);
}
/* get data */
else if (!garray_getfloatarray(a, &x->x_nbpoints, &x->x_vec)){
post("pdp_cheby: %s: bad template", s->s_name);
}
else{
/* calculate approximation */
gsl_cheb_init (x->x_cs, &x->x_F, -1.0, 1.0);
/* propagate coefficients */
for (i=0; i<=x->x_order; i++){
pdp_cheby_coef(x, i, x->x_cs->c[i]);
}
}
x->x_vec = 0;
return;
}
static void pdp_cheby_process(t_pdp_cheby *x)
{
int p0 = pdp_base_get_packet(x, 0);
u32 mask = pdp_imagebase_get_chanmask(x);
pdp_imageproc_cheby_setnbpasses(x->x_cheby, x->x_iterations);
pdp_imageproc_dispatch_1buf(&pdp_imageproc_cheby_process, x->x_cheby, mask, p0);
}
static void pdp_cheby_reset(t_pdp_cheby *x)
{
int i;
for (i = 0; i <= x->x_order; i++)
pdp_imageproc_cheby_setcoef(x->x_cheby, i, 0);
}
static void pdp_cheby_iterations(t_pdp_cheby *x, t_floatarg f)
{
int i = (int)f;
if (i<0) i = 0;
x->x_iterations = i;
}
static void pdp_cheby_free(t_pdp_cheby *x)
{
pdp_imagebase_free(x);
pdp_imageproc_cheby_delete(x->x_cheby);
gsl_cheb_free(x->x_cs);
}
t_class *pdp_cheby_class;
void *pdp_cheby_new(t_floatarg f)
{
t_pdp_cheby *x = (t_pdp_cheby *)pd_new(pdp_cheby_class);
int order = (int)(f);
/* super init */
pdp_imagebase_init(x);
/* create i/o */
pdp_base_add_gen_inlet(x, gensym("float"), gensym("iterations"));
pdp_base_add_pdp_outlet(x);
/* setup callback */
pdp_base_set_process_method(x, (t_pdp_method)pdp_cheby_process);
/* data init */
x->x_cheby = pdp_imageproc_cheby_new(order);
x->x_iterations = 1;
if (order < 2) order = 2;
x->x_order = order;
/* init gls chebychev series object */
x->x_cs = gsl_cheb_alloc(order);
x->x_F.function = pdp_cheby_mappingfunction;
x->x_F.params = x;
x->x_vec = 0;
return (void *)x;
}
#ifdef __cplusplus
extern "C"
{
#endif
void pdp_cheby_setup(void)
{
pdp_cheby_class = class_new(gensym("pdp_cheby"), (t_newmethod)pdp_cheby_new,
(t_method)pdp_cheby_free, sizeof(t_pdp_cheby), 0, A_DEFFLOAT, A_NULL);
pdp_imagebase_setup(pdp_cheby_class);
class_addmethod(pdp_cheby_class, (t_method)pdp_cheby_coef, gensym("coef"), A_FLOAT, A_FLOAT, A_NULL);
class_addmethod(pdp_cheby_class, (t_method)pdp_cheby_iterations, gensym("iterations"), A_FLOAT, A_NULL);
class_addmethod(pdp_cheby_class, (t_method)pdp_cheby_reset, gensym("reset"), A_NULL);
class_addmethod(pdp_cheby_class, (t_method)pdp_cheby_approx, gensym("approx"), A_SYMBOL, A_NULL);
}
#ifdef __cplusplus
}
#endif
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